JPS6221474Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a driving device for a mid-mount mower.

(Prior Art) Conventionally, as a drive device, the cutting blade body of a mid-mounted mower, which is attached to the lower part of the vehicle body so that it can be raised and lowered, is driven by the front PTO shaft of the engine mounted at the front of the vehicle body. There are those described in Japanese Utility Model Application Publication No. 54-168339.

This has a power take-off device that protrudes downward at the front of the vehicle body, and an output shaft that protrudes rearward from the lower end of the power take-off device and an input shaft on the mower body are interlocked and connected via a universal joint shaft. This is what I did.

(Problems to be solved by the invention) This method requires a power take-off device and a universal joint shaft, so it has drawbacks such as being too complex and heavy for small applications, so it cannot be adopted. I couldn't do it.

In view of these conventional problems, the present invention provides a drive device that has a simple structure, is suitable for small size, is safe, and is easy to handle when attached and detached.

(Means for Solving the Problems) The present invention provides a means for solving the problem by replacing the cutting blade body 12 of the mid-mounted mower 9, which is mounted on the lower part of the vehicle body 1 so as to be movable up and down, with the cutting blade body 12 mounted on the front part of the vehicle body 1. In a drive device for a mid-mount mower that is driven by a front PTO shaft 27 protruding forward from the engine 2, a drive pulley 28 is provided at the front end of the front PTO shaft 27, and the mid-mount mower 9
An input pulley 26 is provided on the vertical rotating shaft 11 supported on the mower main body 10 above the belt transmission mechanism 25 that interlocks each cutting blade body 12, and below the drive pulley 28 and below the input pulley 26. A pair of relay pulleys 33 and 34 are provided in front of the drive pulley 28 and the input pulley 26, and the belt 29 is wound around the drive pulley 28 and the input pulley 26 via the pair of relay pulleys 33 and 34.
9 is a drive pulley 28 and relay pulleys 33, 34
It is located between a pair of left and right frames 3 of the vehicle body 1 and is covered from above by a bonnet 4 on the vehicle body 1.

(Embodiment) Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIGS. 1 and 2, 1 is a tractor body, 2 is an engine mounted on the front part of the tractor body 1, and An axle frame 3 is attached. 4 is a bonnet that covers the engine 2, etc., 5 is a steering wheel, 6 is a driver's seat, 7 is a front wheel, and 8 is a rear wheel. 9 is a mid-mount mower, mower body 1
0, the mower main body 10 is provided with a plurality of sets of cutting blade bodies 12 in the horizontal direction, gauge wheels 13 for adjusting the cutting height, etc., which are provided on the mower main body 10 via a vertical rotation shaft 11, and the mower main body 10 has front and rear wheels. 7 and 8, it is attached to the lower abdomen of the tractor body 1 via a pair of left and right bending link mechanisms 14 so as to be able to rise and fall freely. The bending link mechanism 14 is composed of a pair of front and rear upper links 15 and a lower link 16 which are bendably connected to each other by a front and rear connecting shaft 17. At the outer end, each lower link 16 is pivotally connected to a respective bracket 19 on the mower body 10. Each connecting shaft 17 is connected to each lift arm 24 of a hydraulic device 23 via a lifting wire 20 made of Bowden wire, a swing arm 21, and a link 22. Therefore, the mower main body 10 can follow along the ground, and
It can be raised and lowered by a hydraulic device 23. Note that the hydraulic system 23 is mounted at the rear of the tractor body 1. The respective rotation shafts 11 are interlocked and connected to each other via a belt transmission mechanism 25, and an input pulley 26 is fixed to the rotation shaft 11 at the center in the lateral direction on the upper end side above the transmission pulley of the belt transmission mechanism 25. Between this pulley 26 and a drive pulley 28 fixed to the front end of the front PTO shaft 27, there are two
A belt 29 is hung via tension pulleys 33 and 34 which also serve as relays. front
The PTO shaft 27 is connected to a crankshaft 30 of the engine 2 and projects forward from the crankshaft 30. Tension pulleys 33 and 34 are disposed below drive pulley 28 and in front of input pulley 26, and are pivotally supported by tension arm 32 via horizontal shaft 31, as shown in FIG. The belt 29 is hung vertically between the pair of left and right front axle frames 3 between the drive pulley 28 and the tension pulleys 33 and 34, and is hung approximately horizontally between the tension pulleys 33 and 34 and the input pulley 26. It is hung on. A belt support 35, which is generally fan-shaped in side view, is fixed to the tension arm 32 via a bearing boss 36 so as to cover the front side of the tension pulleys 33, 34 and prevent the belt 29 from coming off. The tension arm 32 is fixed to a rotation shaft 38 via a boss 37, and is vertically swingable around the rotation shaft 38. The rotation shaft 38 is supported by the front axle frame 3 via a bracket 39, and a lever 4 is attached to the outer end of the rotation shaft 38.
0 is set. Reference numeral 41 denotes a clutch lever, which is pivoted by a support shaft 43 to a position that can be operated by hand from the driver's seat 6 side, for example, a windshield plate 42 in front of the step. The lever 4 is connected via a connecting rod 46 which is removable and has a tension spring 45.
Connected to 0.

In the above mechanism, when mowing work is to be performed with the mower 9, the state is as shown in FIG. 1. That is, with the mower 9 lowered and the gauge wheel 13 in contact with the ground, each cutting blade body 12 is driven by the power from the front PTO shaft 27. That is, when the clutch lever 41 is set to the connection position A, the tension arm 40 is urged downward via the connecting rod 46 and the tension spring 45, and the tension pulley 3
3 and 34 apply tension to the belt 29, and the power from the front PTO shaft 27 is applied to the drive pulley 28, belt 29, tension pulley 33,
34, the power is transmitted to the mower 9 via the input pulley 26, etc., and each cutting blade body 12 can be driven by this power. In this case, drive pulley 2
8 is directly connected to the crankshaft 30 of the engine 2 via the front PTO shaft 27, and rotates at the same speed as the crankshaft 30, so the cutting blade of the mower 9 is connected via the belt 29 and input pulley 26. The body 12 can be driven at high speed. During work, tension pulley 3
3 and 34 are protected by the belt support 35, so even if there is particularly tall grass, it will not get caught. Also, the belt 29 is attached to the drive pulley 2.
8 and tension pulleys 33 and 34, it is located between the left and right pairs of frames 3, and is protected from the sides by the frames 3, and is protected from the bonnet 4 from above.
Since the belt 29 is protected by the belt 29, there is no risk of getting caught in the belt 29, and the work can be carried out safely.

When stopping the mower 9, it is sufficient to set the clutch lever 41 to the cutting position B, which loosens the tension spring 45 and releases the tension arm 3.
2 swings upward as shown by the imaginary line in FIG. 4, the tension of the belt 29 is reduced and power transmission is cut off. At this time, the belt 29 is held by the belt support 35 so that it cannot be separated from the tension pulleys 33, 34, so even if the tension arm 32 swings up and down, the belt 29 will not come off the tension pulleys 33, 34. Never. Therefore, by operating the clutch lever 41, the tension pulleys 33 and 34 function as a tension clutch, and the power can be reliably interrupted.

When removing the mower 9, the bending link mechanism 14
It is necessary to remove the belt 29 from the input pulley 26 at the same time as removing the belt 29 from the tractor body 1. In this case, since the input pulley 26 is located above the belt transmission mechanism 25, the belt 29 is connected to the input pulley 2.
It can be easily removed from 6.

Note that the mower 9 may be configured as shown in FIGS. 5 and 6. That is, in this moatee 9, the rotating shafts 11 are arranged horizontally in a line, and the rotation loci of the cutting blade bodies 12 are partially overlapped with each other. A belt transmission mechanism 25 having a timing pulley 47 and a timing belt 48 is employed to shift the rotational phase of each cutting blade body 12 so that they do not interfere with each other, and to maintain the phase relationship. Note that 49 is a tension pulley, 50 is a grass release path, and 51 is a guide plate.

(Effect of the invention) The present invention has the advantage that the drive pulley 2 of the front PTO shaft 27
8 and the input pulley 26 of the rotating shaft 11 on the mower body 10 via a pair of relay pulleys 33 and 34, the belt 29 is wrapped around it, so the structure is very simple compared to the conventional one. This allows for significant weight reduction, making it ideal for small-sized applications. In addition, the belt 29 is connected to the drive pulley 28 and the relay pulley 33.
34 is located between the pair of left and right frames 3 of the vehicle body 1 and is covered from above by the bonnet 4 on the vehicle body 1, so there is no risk of it getting caught in the belt 29 and it is safe. Moreover, since the input pulley 26 of the rotating shaft 11 is located above the belt transmission mechanism 25 that interlocks the cutting blade bodies 12, the belt 29 can be easily hooked on and removed from the input pulley 26 when attaching or detaching the mower 9. It is easy to handle when attaching and detaching.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing an embodiment of the present invention, Fig. 2 is a schematic front view of the same, Fig. 3 is an enlarged plan view of the main parts, Fig. 4 is an explanatory view of the same operation, and Fig. 5 is a schematic front view of the same. The figure is a schematic plan view showing another mower, and FIG. 6 is a side view of the same. 1... Tractor body, 2... Engine, 3...
Front PTO shaft, 9...Mitsudo mount mower, 1
0... Mower body, 11... Rotating shaft, 25... Belt transmission mechanism, 26... Input pulley, 27...
Front PTO shaft, 28... Drive pulley, 29...
Belt, 32...Tension arm, 33, 34
...Tension pulley (relay pulley).

Claims (1)

[Scope of utility model registration request] The cutting blade body 12 of the mid-mounted mower 9 mounted on the lower part of the vehicle body 1 so as to be freely raised and lowered is attached to the front part that projects forward from the engine 2 mounted on the front part of the vehicle body 1.
In a drive device for a mid-mount mower that is driven by a PTO shaft 27, a drive pulley 28 is provided at the front end of the front PTO shaft 27, and a drive pulley 28 is provided at the front end of the front PTO shaft 27, and a drive pulley 28 is provided at the front end of the front PTO shaft 27, and a drive pulley 28 is provided at the front end of the front PTO shaft 27. An input pulley 26 is provided on the rotating shaft 11 above the belt transmission mechanism 25 that interlocks the cutting blade bodies 12 with each other, and a pair of input pulleys rotatable about the horizontal axis are provided below the drive pulley 28 and in front of the input pulley 26. Relay pulleys 33 and 34 are provided, and a belt 29 is wound around the drive pulley 28 and input pulley 26 via the pair of relay pulleys 33 and 34. 1. A drive device for a mid-mount mower, which is located between a pair of left and right frames 3 of a vehicle body 1 and is covered from above by a bonnet 4 on a vehicle body 1.